Here is something you should check out -
plus another rig from Canada that looks promising, I couldn't get the link to work but if your of FB join 4x4 vans...
you can for sure find a good van already as a 4x4 in your price range. The Ambo in the link is a 7.3 IDI so no turbo, you won't get any where in a hurry but you can go any where forever cause it's bomb proof and will be solid for a long time... I'd figure he'd take $24K
Good luck in finding you rig.